I concur with the comments about multiple rows of file tabs. Additionally it would be a HUGE help if I could save the group of open files, perhaps with the workspace or something, so that I can quickly change between projects and have the files I'm using for that project opened automatically.

It is available. With version 5.2 you can get File Tab on the bottom. See Tools->Settings->IDE Settings, "Show file tabs on bottom" checkbox.

Thanks for the info.
In the last days I switched from Zend Eclipse to PHPEd and I was like crazy trying to figure out how to have the tabs on bottom (didn't find this info even on Google nor internal help - wrong search terms?).

I come from the old Zend days + EditPlus, where the tabs are all on bottom, so having them on top was pretty annoying.

That was November, 2006! Over two years ago! Two forum pages of people asking for multiple rows of tabs, and nothing in the program yet. Later on, Dmitri said that "This Feature is available in 5.2", but I think he was referring to putting the tabs on the bottom, and not multiple rows of tabs. I personally don't care if the tabs are on the top or the bottom, but multiple rows would be a HUGE thing. I constantly have 20-30 files open at the same time. No longer do we work in an environment where a text file or two defined a web page. We have to have PHP, CSS, & JavaScript files open for each web page, to say nothing of the help page, output page, and any other supplemental pages like templates, class files, etc. And that's just for one web page! How many people work on one web page at a time?

Further, it would be great to be able to save a group of open files, so that group could be closed and later reopened, eliminating the need to re-open each file individually. Changing from one project task to another would be much easier.

Is there any way of having the files which are opened listed in a window, similar to the code navigator? I too have many files open at once, having a list of them at the side in a dockable window would make switching must faster. Even if I could just make the 'Window List Popup' dockable would be a great improvement!

Multiple rows of tabs would be OK, but it starts to eat up screen real-estate from the wrong direction if the only two options are 'top' and 'bottom' - 'Side' would be great!